termination vs expiration

termination and expiration both are nouns.

Word	Noun	Adjective	Verb	Adverb
termination	Yes	No	No	No
expiration	Yes	No	No	No

As nouns, termination and expiration are synonyms defined as:

Other synonyms of termination include expiry.

termination (noun)	expiration (noun)
the act of ending something	the act of expelling air from the lungs
the end of a word (a suffix or inflectional ending or final morpheme)	euphemistic expressions for death
something that results	a coming to an end of a contract period
a place where something ends or is complete
a coming to an end of a contract period